Piston ring



Nov. 114, 1939. I A. c. RICHARDS PISTON RING Filed Sept. 6, 1938 aient Nov. 14,1939

ITED STATES PISTON RING Arthur Charles Richards Leeds, England, as-

signor to Aero Piston Ring Company Limited,

Leeds, England Application September 6, 1938, Serial No. 228,718 In Great Britain June 24, 193i rclaims. (on. soc-i5) WM invention relates to piston rings of the grooved, slotted, or grooved and slotted types designed to control the amount of oil on the cyllnder wall oi an internal combustion engine, the chief object being to provide new or' improved piston rings of these types which will have a greater ciency and which will prevent over oilinc ted or grooved and slotted piston ring has a plurality oi oilways formed through its bottom land and communicating with or leading into the annular groove, or the slots, or the groove and slots in the ring.

The oilways, of which there may be any number, be machined through the bottom land. and they may be cut in line with the solid portions of a slotted or grooved and slotted ring, or they w r be cut in line with the slotted portion oi a slotted or grooved and slotted ring.

in order that the invention may be clearly understood and readily carried into effect, the same will now be more fully described with reference to and by the aid of the embodiments illustrated in the accompanying drawing; wherein:

es 1 and 2 are respectively an inverted plan and a side elevation of a grooved piston ring having the invention applied thereto.

Figure 3 is a section taken on the line A. B. oi e 2.

Figure 4 is a section taken on the line C. D. oi e 2.

Figures 5 and 6 are similar views respectively to Figures 1 and 2, but illustrate the application oi the invention to a grooved and slotted ring.

Figure 7 is a section taken on the line E. F. oi Figure 6.

Fi e 8 oi Figure 6.

Figure 9 is a side view of further modified form of the invention.

is asection taken on the line G. H

Referring to Figures 1 to 4 of the drawing.

the ring is grooved clrcumferentially on its outer 'iace to afford upper and lower lands I, 2 respectively for co-operation with the cylinder wall of an internal combustion engine, and the bottom land 2 has a plurality of oilways indicated at 3. These oilways whichare equally spaced circumferentially are-in the form of arcuate recesses machined out of the edge of the bottom land and extend to the depth of the annular groove between the lands.

In the embodiment illustrated in Figures 5 to 8, in which like reference numerals to those in Figures 1 to 4 indicate like oranalogous parts, the ring in addition to being grooved-to aflord top and bottom lands I, -2 is slotted through radially as indicated at 4 so as to leave only the circcorg to the invention, the grooved, slotcumferentially spaced solid portions 5 interconnecting the top and bottom lands l, i. The oil- 'ways i machined through the bottom land 2 in this construction are located in radial alignment with or opposite the solid portions 5 and are of such a length as to lead into the adjacent ends of the neighbouring slots. In this connection the ends of the slots cut through the grooved centreportion of the ring are inclined or diverge outwardly, as shown, so as to afliord a lead to said slots. a

As shown in Figure 9, the simple or plain ring It) has the spacedcircumferentially disposed slots H and the solid portions it. The oil ways I? arecut in the bottom land in the solid portions betweerf'the slots so as to communicate with the adjacent ends of neighboring slots.

The oilways provide for adequate lubrication and also form outlets for excess oil which may be collected in the slots and/or grooves, particularly when the piston is travelling in an upward direction or toward the cylinder head so that a suctional eflect takes place to draw the oil from the. slots and/or grooves by way of the oilways; Moreover, the invention enables the original pressure per square inch on the top land to be maintained at a maximum value by virtue-of the fact that the provision of the oilways in the lower land allows the wear on the latter to be slightly in" advance of that on the' top land. Further, the balance of the grooved slotted, or grooved and slotted ring is retained since the edge of the bottom land is broken away or interrupted only at spaced pointsto afford the oilways.

I claim:

1. A piston ring having an outer circumferential groove forming top-and bottom lands, said groove being formed with circumierentially disposed spaced slots and solid portions, and said bottom land adjacent the solid portions and between the slots being provided with oil-ways of sufliclent width to extend into adjacent ends of neighboring slots, saidslots coactlng with the oil-ways to provide means to allow-circulation of the oil to insure the removal of surplus oil from all parts of the ring.

2. A piston ring having a circumierentially disposed outer groove, said groove being provided with spaced radial slots and solid portions, and said bottom land adjacent the solid portions and between the-slots being out out to provide oil-- ways communicating with the adjacent ends 0! neighboring slots, the ends of the slots adjacent the cut-away portions being inclined to provide a lead from the oil-ways to said slots,.said slots coacting with the oil-ways to constitute means for allowing circulation'of the oil to insure the removal of surplus oil from all parts of the ring.

ARTHUR- CHARLES RICHARDB. W 

